KR20090128549A - Device for spraying pigmented fluids - Google Patents

Abstract

The invention relates to a device for spraying pigmented fluids by means of an air flow, comprising a base body (1), a spray nozzle (5) located on the front side of the base body (1), the nozzle having a needle (12a) centrally located therein, a compressed air inlet and a connecting compressed air channel (24a), an outlet opening (32) for a pigmented fluid, wherein a regulatable compressed air flow supplied through the compressed air channel (24a) is directed past the outlet opening (32) for the pigmented fluid and loaded with fluid droplets, said fluid droplets being emitted through the spray nozzle (5) as long as the compressed air flow is maintained, wherein the nozzle (5) and the needle (12a) are located in a nozzle head (10a) and the nozzle head (10a) can be removed or replaced as a unit, a storage tank (31) for the pigmented fluid to be sprayed being located in the nozzle head (10a).

Description

Colored liquid spraying device {DEVICE FOR SPRAYING PIGMENTED FLUIDS}

The present invention includes a base body, a spray nozzle disposed at the front side of the base body and having a needle at the center thereof, a compressed air inlet and a compressed air duct adjacent thereto, and an outlet opening for coloring liquid, the adjustable compressed air flow being Guided through the outlet opening for the colored liquid loaded through the spray nozzle and loaded with droplets of liquid discharged through the spray nozzle as long as the compressed air flow is maintained, the nozzle and needle are entirely removable or replaceable nozzles A device for spraying colored liquids by air flows respectively disposed within a head.

Such a device is described in DE 10 2005 038 162.6.

In known devices, colored liquid is supplied from the outer receptacle through the inlet opening.

It is an object of the present invention to develop a device of the general type in a manner that achieves easier operation.

This object is achieved according to the invention by disposing a receptacle for the colored liquid to be sprayed inside the nozzle head. A nozzle support with an already filled receptacle can be used. Alternatively, the receptacles may be individually charged or recharged. To this end, a filling opening in connection with the receptacle may be provided. The filling opening is preferably covered by a slit partition wall made of silicon.

The receptacle can be placed around the needle to achieve a small, symmetrical design.

According to another preferred embodiment, the receptacle has a hollow cylindrical basic shape with a conical tapered front end region forming an outlet opening and a trailing end region where the sealing element is inserted into the receptacle. The two end regions are respectively arranged in the front and rear portions in the axial direction, ie in the direction defined by the longitudinal center axis of the needle. Thus, a hollow space is formed in the receptacle for containing the coloring liquid, which is sealed at the front and the rear. The rear closure is in particular provided by a sealing element consisting of Teflon. The closing of the front is carried out by a needle which closes the outlet opening, especially when in the rest position, ie inactive. To this end, the needle is forcibly fitted or compressed into a conically tapered sheet of the outlet opening and / or disposed in this sheet in a tight manner.

According to another preferred embodiment, the sealing element is in close contact with the inner wall of the receptacle to provide a sealing effect. Moreover, the sealing element has a passage opening in which the needle is guided in an axially movable manner, and the contact between the sealing element and the needle in the passage opening is narrow enough to provide a sealing effect. The sealing element is inserted into the receptacle, in particular for an interference fit. It is preferred that the form of the interference fit is also provided between the needle and the sealing element. However, the contact force between the needle and the sealing element is preferably lower than between the sealing element and the receptacle inner wall since the needle must be capable of reciprocating movement in the passage opening. In this way, the two contact areas between the sealing element and the receptacle and between the sealing element and the needle are designed in a tight manner so as to avoid the discharge of the coloring liquid.

According to another preferred embodiment, the contact force between the sealing element and the guided needle through the sealing element is defined to maintain the relative position between the sealing element and the needle as long as there is no influence of external forces. The influence of external forces is understood in particular as the force exerted by the operating ram of the spraying device. In particular, this ensures that the needle cannot move away from the rest position by itself without any external force, which refers to the position where the needle is placed in the seat of the outlet opening in a tight enough manner to provide a sealing effect. In particular, the passage diameter of the passage opening of the sealing element is about 1% to about 5%, in particular about 2%, smaller than the diameter of the needle in the region located in the passage opening when in the assembled state. According to an optional embodiment, an additional spring may be provided for pressing the needle into the seat of the outlet opening, which prevents accidental opening of the outlet opening and thus undesired outflow of the colored liquid stored in the receptacle.

According to another preferred embodiment, the rear end of the needle is firmly but detachably connected to the actuating ram by mechanical means. This allows nozzle heads to be replaced while ensuring simple and robust operation of the spray device.

According to another preferred embodiment, the connection between the rear end of the needle and the actuating ram is made by a positive fit. For example, a form of removable bayonet coupling may be provided between the rear end of the needle and the actuating ram.

1 is a partially exploded perspective view of a colored liquid spray apparatus of the general type known from DE 10 2005 038 162.6.

2 is a cross-sectional view through a nozzle support of the colored liquid spraying device according to the present invention.

Preferred embodiments of the invention are described in more detail below with reference to the accompanying drawings.

The colored liquid spraying device according to the invention has a longitudinal base body 1 which can be hand-held in the same way as a pencil, and a pigment receiving nozzle part 2 arranged at its front end.

The pigment-receiving nozzle part 2 has a conical nozzle cover 3 having a passage and a guide hole 4 for the nozzle 5, and a safety cover 6 overlapping the nozzle cover 3 and the ring body 7. ).

The ring body 7 has an annular circumferential groove 8 and a guide collar 9 of the base body 1 which meshes with the groove 8 so that the ring body 7 is mounted for rotation by 360 °. Have

Furthermore, a nozzle support 10 forming the nozzle head is disposed in the pigment accommodating nozzle part 2, and the nozzle pipe 11 extends from the nozzle support 10 so that the nozzle 5 is at the tip of the nozzle pipe 11. Is formed. The needle 12 is located in the nozzle pipe 11 and the needle 12 is actuated by a helical spring 13. The helical spring 13 and the needle 12 are located in the longitudinal hole 14 of the nozzle support 10, and the longitudinal hole 14, as described by the longitudinally displaceable ram 15, is described below. It works inside.

The nozzle support 10 may have a substantially circular outer shape and be shaped to fit the ring body 7. The side projections 16 of the nozzle support 10 do not rotate relative to the ring body 7 but engage with slots (not shown) of the ring body 7 so as to be rotatable about the base body 1.

Pigment inlets 17 having the shape of recesses are formed in the projections 16 and either the connecting hose to the pigment reservoir or the connecting plug of the small, directly attachable pigment reservoir is insertable into the pigment inlet 17.

The ring body 7 has a male screw 18 to which the female screw 19 of the safety cover 6 is screwed. In this way, the nozzle cover 3 can be attached to the ring body 7 via the safety cover 6, and at the same time, the nozzle support 10 located in the front side recess of the base body 1 is removed. Fix in the axial direction.

From the above description, the entire pigment receiving nozzle part 2 is rotatable about the base body 1, and the nozzle together with the pigment inlet 17, the nozzle 5, the nozzle needle 12, and the helical spring 13. It is clear that the support 10 can be replaced in such a way that no pigment receptacles are left, ie by inserting a new nozzle part 10 so that the operation can continue without any problem with another pigment.

The rear end of the nozzle needle portion 12 is attached to the helical spring 13, and the front end of the helical spring 13 causes the forward movement of the actuating ram 15 to cause the helical spring 13 to be compressed and The back movement rests on the tapered nozzle 5 in such a way that the helical spring 13 pulls the nozzle needle 12 back.

The actuating ram 15 is operable in the direction of the arrow P and is attached at the inner end 20 to an actuating lever H mounted to rotate about the pivot axis 21, the actuating lever H being the restoring spring. When moved in the direction of arrow P against the force of 22, the actuating ram 15 moves to the right or back, respectively, so that the helical spring 13 will move the needle 12 to the right in the drawing. To allow the passage opening of the nozzle 5 to gradually increase in size as it moves further to the right or back, respectively, so that a greater amount of pigment can be transferred correspondingly.

An air inlet 23 is provided at the rear end of the base body 1. An air duct 24 made of a hose-shaped, flexible material is inward adjacent to the air inlet 23. The guide 25 of the regulating wheel 26 having a chunky surface extends at an angle with respect to the air duct 24, and the regulating wheel 26 meshes with the compressed air duct 24 and moves forward. Opening the air duct 24 and moving it backwards closes the air duct 24 so that the throughput of the compressed air can be adjusted.

The compressed air duct 24 is opened into the conical tapered nozzle cover 3 to accelerate the air flow and to flow past the nozzle 5, thereby reducing the low pressure generated by the Venturi effect. Thereby introducing the pigment from the pigment duct 27 adjacent to the pigment inlet 17 so that the pigment-air mixture is discharged through the nozzle 5.

Compressed air can be generated, for example, by a compressor. Maximum working pressure reaches 3 bar.

When the actuation lever H is in the forward locking position, the air duct 24 is guided past the actuation lever H and compressed near the 28. When the actuation lever H is moved in the direction of the arrow P, the actuation lever H causes the nozzle 5 to be opened by the rearward movement of the needle 12, so that the compressed air duct 24 has already been described above. ) At the same time.

The travel of the actuation lever H can be restricted or regulated by the crooked nut 29, so that a constant thickness of the spray line can be maintained for a longer time. The crooked nut 29 is located on the threaded rod 30 which is axially displaced by the rotational movement of the nut 29 to achieve a displaceable stop of the actuation lever H.

In the above-described device of the general form, it is provided that the coloring liquid is supplied from the outside through the pigment inlet 17.

On the other hand, in the embodiment of the spraying device according to the invention shown in FIG. 2, the needle 12a and the helical spring 13a are inside a substantially hollow cylindrical receptacle 31 for the coloring liquid to be sprayed. There is a replaceable nozzle head 10a which is arranged directly. The receptacle 31 has a conical taper at its axial tip and has an outlet opening 32 whose inner wall forms a conical tapered sheet 32a in the forward direction as well. Needle 12a is tapered at its tip to form needle tip 12b passing through outlet opening 32. The needle tip 12b is disposed in the seat 32a in a tight manner to prevent the outflow of liquid in the rest position of the needle 12a shown in FIG. The inner wall of the sheet 32a and the outline of the needle tip 12b are mated with each other. In particular, they have the same conical shape, i.e., the same tilt angle with respect to the longitudinal central axis 36 or the entire spraying device on the needle 12a.

In the vicinity of the outlet opening 32, the nozzle head air duct 24a ends outside of the receptacle 31 tapered conically at the tip, and the nozzle head air duct 24a is compressed air duct 24 shown in FIG. ). The nozzle head air duct 24a extends between the receptacle 31 and the outer nozzle cap 37 of the replaceable nozzle head 10a.

At the axial end or the rear end of the receptacle 31, a sealing element in the shape of the Teflon seal 33 is inserted into the receptacle 31 by an interference fit to prevent the outflow of liquid. The teflon seal 33 has a central passage opening 33a through which the needle 12a is guided. Guide of the needle 12a through the passage opening 33a is designed to allow axial reciprocating movement of the needle 12a while ensuring a tight seal to prevent the outflow of liquid.

Therefore, an accommodating space 31a is formed inside the receptacle 31 for accommodating the colored liquid to be sprayed. This receiving space 31a is receptacle 31 at the leading end by the nipple tip 12b which is tightly disposed in the seat 32a of the outlet opening 32 when in the rest position and at the rear end by the Teflon seal 33. Is defined laterally by the wall.

A refill opening 34 is disposed in the cylindrical wall of the cavity of the receptacle 31, and the refill opening 34 is closed by the slit silicon septum 35. In this embodiment, the silicon partition 35 is inserted into another opening 34a provided in the nozzle cap 37 to be aligned with the refilling opening 34 and has a slit 35a having a pressure compensation function. If the colored liquid is discharged from the receiving space 31a of the receptacle 31 while the spraying device is operated, the slit 35a causes air to enter the receiving space 31a, causing pressure compensation to occur. Otherwise, the low pressure generated in the accommodation space 31a may affect the function of the spraying device. On the other hand, the slit silicon partition wall 35 is designed such that colored liquid cannot be discharged through the slit 35a. Thus, the silicon bulkhead 35 has a dual function on the one hand, while providing pressure compensation and on the other hand preventing the outflow of liquid.

In the receiving space 31a, the needle 12a has a stop washer 12c which is firmly attached to the needle 12a by, for example, using an adhesive or by pressing or welding. The helical spring 13a is designed as a compression spring and is fixed between the stop washer 12c and the teflon seal 33 to compress the needle tip 12b of the needle 12a into the seat 32a. When the spraying device is activated, the needle 12a is moved rearward in the axial direction against the spring force of the helical spring 13a, so that the outlet opening 32a is slightly opened.

The tip of the needle 12a is guided by a conical tapered tip region of the receptacle 31, in particular a seat 32a provided therein, the rear portion of the needle 12a being a Teflon seal 33, in particular, Guided by the passage opening 33a of the Teflon seal 33.

In order to operate the spray device, the needle 12a is positively connected in a removable manner to the actuating ram 15a. This connection is designed for the axial transfer of force from the actuating ram 15a to the needle 12a. To this end, the needle 12a has a fixed end portion 12d which is corrugated or curved at the rear axial end on one side of the Teflon seal 33 away from the accommodation space 31a, and this fixed end portion 12d is in an assembled state. Is in engagement with a corresponding radial hole 15b of the actuating ram 15a. This connection is detachable, for example, in the form of a bayonet coupling which makes it possible to replace the nozzle head 10a with the needle 12a.

In addition to the needle 12a, the replaceable nozzle head 10a has a teflon seal 33 inserted therein and a receptacle 31 which is somewhat filled with a coloring liquid based on the current filling state, and a spiral spring 13a inserted therein. And an external nozzle cap 37 having a silicon partition 35. The nozzle cap 37 is detachably connected to the base body 1 of the spraying device by suitable fastening means, not shown in FIG. 2, such as the projection coupling. By the receptacle 31, the nozzle head 10a is provided with a liquid container which is integrally integrated. In particular, the spraying device according to the invention designed as a hand-held device can be operated independently of the external liquid supply, in particular without requiring a large external liquid container attached separately to the nozzle head 10a. have.

Claims (10)

The base body 1, the spray nozzle 5 disposed on the front side of the base body 1 and the needle 12 in the center thereof, the compressed air inlet 23, and the compressed air ducts 24, 24a adjacent thereto. ), An outlet opening 32 for coloring liquid, wherein the adjustable compressed air stream is supplied through the compressed air ducts 24 and 24a and the liquid is discharged through the spray nozzle 5 as long as the compressed air stream is maintained. Guided past the outlet opening 32 for the colored liquid loaded with droplets of air, the nozzle 5 and the needles 12, 12a being disposed in the nozzle heads 10, 10a which are entirely removable or replaceable An apparatus for spraying a colored liquid by flow, A device characterized in that a receptacle (31) for coloring liquid to be sprayed is arranged in the nozzle head (10a). 2. Device according to claim 1, characterized in that a filling opening (34, 34a) is provided to connect with the receptacle (31). The device according to claim 2, wherein the filling openings (34, 34a) are covered with slit bulkheads (35). 4. Device according to claim 3, characterized in that the partition (35) is made of silicon. 2. Device according to claim 1, characterized in that the receptacle (31) is arranged around the needle (12a). 2. The cavity basic shape according to claim 1, wherein the receptacle 31 has a conical tapered front region forming an outlet opening 32 and a rear end region in which the sealing element 33 is inserted into the receptacle 31. Device having a. The sealing element 33 is in close contact with the inner wall of the receptacle 31 to provide a sealing effect, wherein the sealing element 33 is a passage opening 33a through which the needle 12 is guided in an axially movable manner. And the contact between the sealing element (33) and the needle (12) in the passage opening (33a) is narrow enough to provide a sealing effect. The contact force between the sealing element 33 and the guided needle 12 through the sealing element 33 is relative to the sealing element 33 and the needle 12 as long as there is no influence of external forces. And is defined to maintain position. 2. Device according to claim 1, characterized in that the rear end of the needle (12) is firmly but detachably connected to the actuating ram (15a) for mechanical means. 10. The device according to claim 9, wherein the connection between the rear end of the needle (12) and the actuating ram (15a) is made by a positive fit.

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